【摘要】：為了深入研究貧瀝青碎石這種新型材料作為中間層結(jié)構(gòu)時,其材料組成對緩解半剛性基層反射裂縫的效果,運用多級嵌擠理論,采用逐級填充設計方法,對貧瀝青碎石粗、細集料進行設計.研究7種礦料級配組成及其各自最佳瀝青用量,通過對貧瀝青碎石的強度、CBR(加州承載比)、高溫性、水穩(wěn)性等性能進行研究比選,給出了推薦的級配范圍;在選定的級配范圍和最佳瀝青用量內(nèi)進行貧瀝青碎石粉膠比設計,并鋪筑試驗路進行路用性能驗證.研究結(jié)果表明,當粗、細集料比例在3∶1~17∶3,最佳瀝青用量為2.52%~2.75%,粉膠比為0.78~1.22時,該新型材料具有很好的延緩路面反射裂縫的功能,其組成配比及設計方法對防治半剛性基層反射裂縫具有重要意義.
[Abstract]:In order to deeply study the effect of lean asphalt macadam as the intermediate layer structure, its material composition can alleviate the reflective crack of semi-rigid base, the multi-stage embedding theory and the step-by-step filling design method are used to reduce the thickness of lean asphalt crushed stone. Fine aggregate design. The gradation composition of 7 kinds of mineral materials and their respective optimum bitumen dosage are studied. The recommended gradation range is given by comparing and selecting the strength of poor asphalt gravel, CBR (California load ratio), high temperature and water stability, and so on. The lean asphalt macadam powder / binder ratio design was carried out in the selected gradation range and the best asphalt dosage, and the road performance was verified by paving the test road. The results show that when the ratio of coarse aggregate to fine aggregate is 3 ~ 1 ~ 17 ~ 3, the optimum asphalt dosage is 2.52% ~ 2.75%, and the ratio of powder to binder is 0.78 ~ 1.22, the new material has a good function of delaying the reflection crack of pavement. The composition ratio and design method are of great significance for the prevention and control of reflective cracks in semi-rigid base.
【作者單位】： 長安大學公路學院;中交第四航務工程勘察設計院有限公司;西安公路研究院;
【基金】：陜西省自然科學基金資助項目(2011JM7001) 陜西省交通廳科技計劃項目(15-08K) 甘肅省交通運輸廳科研項目(201227)
【分類號】：U414

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